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Darren STATES 'PATENr @risica J. F. ROCHOW, OF NEW YORK, N. Y.

llvliUPtOVEMl-NT IN HOISTING APPARATUS.

Specification forming part of Letters Patent No. 37,110, dated December9, 186i?.

.T0 @ZZ wlw/it t ntay concern:

De it known that I, J. F. ROCHOW, of the city, county, and State of NewYork, have invented a new and Improved Hoisting Apparatus; and I dohereby declare that the following is a full, clear, and exactdescription of the same, reference being had to the aecompanyingdrawings, forming a part of this specification, in which- Figure lrepresents a longitudinal vertical section el' my invention, the planeof section being indicated by the line x x, Fig. 2. Fig. 2 is atransverse vertical section ofthe same, Jaken in the plane indicated bythe line y y,

Similar letters of reference in both views indicate corresponding parts.

rl`his invention is based on the principle of the differential wheels,and its object is to produce a hoisting apparatus of great power in asmall compass.

The invention consists in the arrangement of two cog wheels with adifferent number of teeth, that one with the largest number of teethbeing stationary and the other being secured to the axle of the drum ofthe hoisting apparatus, in combination with two other cog-wheels havingthe saine number of teeth, and attached to a tumbling-shaft which iscarried round the center of the drum-shaft in such a manner that by thecombined action of the two wheels on the tumbling-shaft and thediiferential wheels a slow rotary motion is imparted to the drum-shaft,and that the power applied to the tumblingshaft is multiplied inproportion to the number of teeth of the gearwheel on the drum-shaftdivided by the difference between the number of teeth of said wheel andthat of the stationary wheel.

To enable those skilled in the art to make and use my invention, I willproceed to describe its construction and operation with reference to thedrawings.

The drum A, on which the hoisting rope or chain winds, is secured to ashaft, B, which has its bearing in a box or frame, C, of castiron or anyothersuitable material. To the end of the box U a cog'w'neel, a., isrigidly attached, and another cog-wheel, b, is fastened to the shaft Bclose before the cog-wheel a. The wheel b has one or more teeth lessthan the wheel a, and it gears into a wheel or pinion, c, which isfirmly attached to the tumbling-shaft D. Another pinion, d, which gearsinto the stationary wheel a, is also rigidly attached to thetumbling-shafthD, and the two pinions c cl are provided with the samenumber of teeth. The tumbling-shaft D has its bearings in two disks, ef,which form tlie heads of a drum, E, the disk c having its bearing on theoutside of the box C, behind the wheel a., and the diskf, on the end ofthe main shaft, B, as clearly shown in Fig. l. The diskfis cast in onepiece with the face of the drum E, and the two disks cf are connectedtogether by screws g. From the center of disk f a square, h, projects toapply the winch F.

The operation is as follows: By imparting to the drum E a rotarymotionin the direction of arrow l, Fig. 2, the tumblingshaft D iscarried around the wheels a b, and the pinion d, by gearing in the wheela, assumes a rotary motion in the direction of arrow 2. If the wheel dhas nineteen cogs, each complete revolution of the drum causes thepinion d' to rotate over the same distance; or, if this pinion isprovided with nineteen teeth, to make one complete revolution. Thismotion is imparted to the tumbling-shaft D and pinion c, and the latter,being the same size as the pinion d, will complete one revolution at thesame time the pinion cl completes its revolution. It is obvious that ifthe wheel ZJ had the same number of teeth as the wheel a, the main shaftB would remain stationary; but if the wheel b. has only seventeen teethto the nineteen of the wheel a, each tooth of the latter wheel, throughthe action of the pinions d c, will produce -1l.-,1-1=, of a revolutionof thewheel bin the direction of arrow 3, and consequently the nineteenteeth of the wheel a will produce 1.745%:1-27- of a revolution of thewheel b and with it of the main shaft B and drum A. By making the winchF`twiee as long as the radius of the drum A the power applied to thewinch will be increased seventeen times, and it is obvious that byehangin g the proportion between the-number of teeth of the wheels a bthe power can be still further increased with the saine number ofwheels.

Instead of making the wheels a b of unequal diameters and numbers ofteeth, they may be made equal, and the pinions c d might be made to takethe place of the differential Wheels; or both pair of wheels may be madeof unequal'diameters and numbers of cogs.

When desired, the drum F maybe used'as a brake-Wheel by placing asuitable strap around its circumference. In most cases, however, nobrake will .be required, the position ofthe wheels and pinions beingsuch that a Weightsuspended from the drum A will not be able to producea motion of the pinions o d, tumblingshaft D, and drum E. By thisarrangement of the wheels a b c d the Whole hoisting apparatus can bebrought into a very smallr compass, and the 'power can be multiplied toany desired degree Without teria-Uy increasing the size or weight of theWorkingvparts.

Having thus fully described my invention,

what I claim as new, and desire to secure by Letters Patent, is-

l. The arrangement oi' the differential Wheels a b, in combination withthe box C, main shaft B, tumbling-shaft D, with pinions e d, and

-drurn E, all constructed and operating sub-

